11c248b7dSInki Dae /* exynos_drm_gem.c 21c248b7dSInki Dae * 31c248b7dSInki Dae * Copyright (c) 2011 Samsung Electronics Co., Ltd. 41c248b7dSInki Dae * Author: Inki Dae <inki.dae@samsung.com> 51c248b7dSInki Dae * 6d81aecb5SInki Dae * This program is free software; you can redistribute it and/or modify it 7d81aecb5SInki Dae * under the terms of the GNU General Public License as published by the 8d81aecb5SInki Dae * Free Software Foundation; either version 2 of the License, or (at your 9d81aecb5SInki Dae * option) any later version. 101c248b7dSInki Dae */ 111c248b7dSInki Dae 12760285e7SDavid Howells #include <drm/drmP.h> 131c248b7dSInki Dae 142b35892eSInki Dae #include <linux/shmem_fs.h> 151c248b7dSInki Dae #include <drm/exynos_drm.h> 161c248b7dSInki Dae 171c248b7dSInki Dae #include "exynos_drm_drv.h" 181c248b7dSInki Dae #include "exynos_drm_gem.h" 191c248b7dSInki Dae #include "exynos_drm_buf.h" 201c248b7dSInki Dae 211c248b7dSInki Dae static unsigned int convert_to_vm_err_msg(int msg) 221c248b7dSInki Dae { 231c248b7dSInki Dae unsigned int out_msg; 241c248b7dSInki Dae 251c248b7dSInki Dae switch (msg) { 261c248b7dSInki Dae case 0: 271c248b7dSInki Dae case -ERESTARTSYS: 281c248b7dSInki Dae case -EINTR: 291c248b7dSInki Dae out_msg = VM_FAULT_NOPAGE; 301c248b7dSInki Dae break; 311c248b7dSInki Dae 321c248b7dSInki Dae case -ENOMEM: 331c248b7dSInki Dae out_msg = VM_FAULT_OOM; 341c248b7dSInki Dae break; 351c248b7dSInki Dae 361c248b7dSInki Dae default: 371c248b7dSInki Dae out_msg = VM_FAULT_SIGBUS; 381c248b7dSInki Dae break; 391c248b7dSInki Dae } 401c248b7dSInki Dae 411c248b7dSInki Dae return out_msg; 421c248b7dSInki Dae } 431c248b7dSInki Dae 44dcf9af82SInki Dae static int check_gem_flags(unsigned int flags) 452b35892eSInki Dae { 46dcf9af82SInki Dae if (flags & ~(EXYNOS_BO_MASK)) { 47dcf9af82SInki Dae DRM_ERROR("invalid flags.\n"); 48dcf9af82SInki Dae return -EINVAL; 49dcf9af82SInki Dae } 50dcf9af82SInki Dae 51dcf9af82SInki Dae return 0; 52dcf9af82SInki Dae } 53dcf9af82SInki Dae 54c01d73faSInki Dae static void update_vm_cache_attr(struct exynos_drm_gem_obj *obj, 55c01d73faSInki Dae struct vm_area_struct *vma) 56c01d73faSInki Dae { 57c01d73faSInki Dae DRM_DEBUG_KMS("flags = 0x%x\n", obj->flags); 58c01d73faSInki Dae 59c01d73faSInki Dae /* non-cachable as default. */ 60c01d73faSInki Dae if (obj->flags & EXYNOS_BO_CACHABLE) 61c01d73faSInki Dae vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); 62c01d73faSInki Dae else if (obj->flags & EXYNOS_BO_WC) 63c01d73faSInki Dae vma->vm_page_prot = 64c01d73faSInki Dae pgprot_writecombine(vm_get_page_prot(vma->vm_flags)); 65c01d73faSInki Dae else 66c01d73faSInki Dae vma->vm_page_prot = 67c01d73faSInki Dae pgprot_noncached(vm_get_page_prot(vma->vm_flags)); 68c01d73faSInki Dae } 69c01d73faSInki Dae 70dcf9af82SInki Dae static unsigned long roundup_gem_size(unsigned long size, unsigned int flags) 71dcf9af82SInki Dae { 720519f9a1SInki Dae /* TODO */ 730519f9a1SInki Dae 74dcf9af82SInki Dae return roundup(size, PAGE_SIZE); 752b35892eSInki Dae } 762b35892eSInki Dae 770519f9a1SInki Dae static int exynos_drm_gem_map_buf(struct drm_gem_object *obj, 782b35892eSInki Dae struct vm_area_struct *vma, 792b35892eSInki Dae unsigned long f_vaddr, 802b35892eSInki Dae pgoff_t page_offset) 812b35892eSInki Dae { 822b35892eSInki Dae struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj); 832b35892eSInki Dae struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer; 844ddc404bSRahul Sharma struct scatterlist *sgl; 852b35892eSInki Dae unsigned long pfn; 864ddc404bSRahul Sharma int i; 872b35892eSInki Dae 884ddc404bSRahul Sharma if (!buf->sgt) 894ddc404bSRahul Sharma return -EINTR; 904ddc404bSRahul Sharma 91465ed660SPrathyush K if (page_offset >= (buf->size >> PAGE_SHIFT)) { 92465ed660SPrathyush K DRM_ERROR("invalid page offset\n"); 93465ed660SPrathyush K return -EINVAL; 94465ed660SPrathyush K } 95465ed660SPrathyush K 964ddc404bSRahul Sharma sgl = buf->sgt->sgl; 974ddc404bSRahul Sharma for_each_sg(buf->sgt->sgl, sgl, buf->sgt->nents, i) { 984ddc404bSRahul Sharma if (page_offset < (sgl->length >> PAGE_SHIFT)) 994ddc404bSRahul Sharma break; 1004ddc404bSRahul Sharma page_offset -= (sgl->length >> PAGE_SHIFT); 1014ddc404bSRahul Sharma } 1024ddc404bSRahul Sharma 1034ddc404bSRahul Sharma pfn = __phys_to_pfn(sg_phys(sgl)) + page_offset; 1042b35892eSInki Dae 1052b35892eSInki Dae return vm_insert_mixed(vma, f_vaddr, pfn); 1062b35892eSInki Dae } 1072b35892eSInki Dae 1082364839aSJoonyoung Shim static int exynos_drm_gem_handle_create(struct drm_gem_object *obj, 1092364839aSJoonyoung Shim struct drm_file *file_priv, 1102364839aSJoonyoung Shim unsigned int *handle) 1111c248b7dSInki Dae { 1121c248b7dSInki Dae int ret; 1131c248b7dSInki Dae 1141c248b7dSInki Dae /* 1151c248b7dSInki Dae * allocate a id of idr table where the obj is registered 1161c248b7dSInki Dae * and handle has the id what user can see. 1171c248b7dSInki Dae */ 1181c248b7dSInki Dae ret = drm_gem_handle_create(file_priv, obj, handle); 1191c248b7dSInki Dae if (ret) 1202364839aSJoonyoung Shim return ret; 1211c248b7dSInki Dae 1221c248b7dSInki Dae DRM_DEBUG_KMS("gem handle = 0x%x\n", *handle); 1231c248b7dSInki Dae 1241c248b7dSInki Dae /* drop reference from allocate - handle holds it now. */ 1251c248b7dSInki Dae drm_gem_object_unreference_unlocked(obj); 1261c248b7dSInki Dae 1272364839aSJoonyoung Shim return 0; 1282364839aSJoonyoung Shim } 1291c248b7dSInki Dae 1302364839aSJoonyoung Shim void exynos_drm_gem_destroy(struct exynos_drm_gem_obj *exynos_gem_obj) 1312364839aSJoonyoung Shim { 1322364839aSJoonyoung Shim struct drm_gem_object *obj; 133c01d73faSInki Dae struct exynos_drm_gem_buf *buf; 1342364839aSJoonyoung Shim 1352364839aSJoonyoung Shim DRM_DEBUG_KMS("%s\n", __FILE__); 1362364839aSJoonyoung Shim 1372364839aSJoonyoung Shim obj = &exynos_gem_obj->base; 138c01d73faSInki Dae buf = exynos_gem_obj->buffer; 1392364839aSJoonyoung Shim 1402364839aSJoonyoung Shim DRM_DEBUG_KMS("handle count = %d\n", atomic_read(&obj->handle_count)); 1412364839aSJoonyoung Shim 142c374e731SInki Dae /* 143c374e731SInki Dae * do not release memory region from exporter. 144c374e731SInki Dae * 145c374e731SInki Dae * the region will be released by exporter 146c374e731SInki Dae * once dmabuf's refcount becomes 0. 147c374e731SInki Dae */ 148c374e731SInki Dae if (obj->import_attach) 149c374e731SInki Dae goto out; 150c374e731SInki Dae 151c01d73faSInki Dae exynos_drm_free_buf(obj->dev, exynos_gem_obj->flags, buf); 1522b35892eSInki Dae 153c374e731SInki Dae out: 154c01d73faSInki Dae exynos_drm_fini_buf(obj->dev, buf); 1552b35892eSInki Dae exynos_gem_obj->buffer = NULL; 1562364839aSJoonyoung Shim 1572364839aSJoonyoung Shim if (obj->map_list.map) 1582364839aSJoonyoung Shim drm_gem_free_mmap_offset(obj); 1592364839aSJoonyoung Shim 1602364839aSJoonyoung Shim /* release file pointer to gem object. */ 1611c248b7dSInki Dae drm_gem_object_release(obj); 1621c248b7dSInki Dae 1631c248b7dSInki Dae kfree(exynos_gem_obj); 1642b35892eSInki Dae exynos_gem_obj = NULL; 1652364839aSJoonyoung Shim } 1662364839aSJoonyoung Shim 167b2df26c1SInki Dae struct exynos_drm_gem_obj *exynos_drm_gem_init(struct drm_device *dev, 1682364839aSJoonyoung Shim unsigned long size) 1692364839aSJoonyoung Shim { 1702364839aSJoonyoung Shim struct exynos_drm_gem_obj *exynos_gem_obj; 1712364839aSJoonyoung Shim struct drm_gem_object *obj; 1722364839aSJoonyoung Shim int ret; 1732364839aSJoonyoung Shim 1742364839aSJoonyoung Shim exynos_gem_obj = kzalloc(sizeof(*exynos_gem_obj), GFP_KERNEL); 1752364839aSJoonyoung Shim if (!exynos_gem_obj) { 1762364839aSJoonyoung Shim DRM_ERROR("failed to allocate exynos gem object\n"); 1772364839aSJoonyoung Shim return NULL; 1782364839aSJoonyoung Shim } 1792364839aSJoonyoung Shim 1802b35892eSInki Dae exynos_gem_obj->size = size; 1812364839aSJoonyoung Shim obj = &exynos_gem_obj->base; 1822364839aSJoonyoung Shim 1832364839aSJoonyoung Shim ret = drm_gem_object_init(dev, obj, size); 1842364839aSJoonyoung Shim if (ret < 0) { 1852364839aSJoonyoung Shim DRM_ERROR("failed to initialize gem object\n"); 1862364839aSJoonyoung Shim kfree(exynos_gem_obj); 1872364839aSJoonyoung Shim return NULL; 1882364839aSJoonyoung Shim } 1892364839aSJoonyoung Shim 1902364839aSJoonyoung Shim DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj->filp); 1912364839aSJoonyoung Shim 1922364839aSJoonyoung Shim return exynos_gem_obj; 1931c248b7dSInki Dae } 1941c248b7dSInki Dae 195f088d5a9SInki Dae struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev, 1962b35892eSInki Dae unsigned int flags, 197ee5e770eSJoonyoung Shim unsigned long size) 198f088d5a9SInki Dae { 1992364839aSJoonyoung Shim struct exynos_drm_gem_obj *exynos_gem_obj; 2002b35892eSInki Dae struct exynos_drm_gem_buf *buf; 2012b35892eSInki Dae int ret; 202f088d5a9SInki Dae 203dcf9af82SInki Dae if (!size) { 204dcf9af82SInki Dae DRM_ERROR("invalid size.\n"); 205dcf9af82SInki Dae return ERR_PTR(-EINVAL); 206dcf9af82SInki Dae } 207f088d5a9SInki Dae 208dcf9af82SInki Dae size = roundup_gem_size(size, flags); 209dcf9af82SInki Dae DRM_DEBUG_KMS("%s\n", __FILE__); 210dcf9af82SInki Dae 211dcf9af82SInki Dae ret = check_gem_flags(flags); 212dcf9af82SInki Dae if (ret) 213dcf9af82SInki Dae return ERR_PTR(ret); 2142b35892eSInki Dae 2152b35892eSInki Dae buf = exynos_drm_init_buf(dev, size); 2162b35892eSInki Dae if (!buf) 217ee5e770eSJoonyoung Shim return ERR_PTR(-ENOMEM); 218f088d5a9SInki Dae 2192364839aSJoonyoung Shim exynos_gem_obj = exynos_drm_gem_init(dev, size); 2202364839aSJoonyoung Shim if (!exynos_gem_obj) { 2212b35892eSInki Dae ret = -ENOMEM; 222dcf9af82SInki Dae goto err_fini_buf; 223f088d5a9SInki Dae } 224f088d5a9SInki Dae 2252b35892eSInki Dae exynos_gem_obj->buffer = buf; 2262b35892eSInki Dae 2272b35892eSInki Dae /* set memory type and cache attribute from user side. */ 2282b35892eSInki Dae exynos_gem_obj->flags = flags; 2292b35892eSInki Dae 2302b35892eSInki Dae ret = exynos_drm_alloc_buf(dev, buf, flags); 2312b35892eSInki Dae if (ret < 0) { 2322b35892eSInki Dae drm_gem_object_release(&exynos_gem_obj->base); 233dcf9af82SInki Dae goto err_fini_buf; 2342b35892eSInki Dae } 235f088d5a9SInki Dae 236f088d5a9SInki Dae return exynos_gem_obj; 237dcf9af82SInki Dae 238dcf9af82SInki Dae err_fini_buf: 2392b35892eSInki Dae exynos_drm_fini_buf(dev, buf); 2402b35892eSInki Dae return ERR_PTR(ret); 241f088d5a9SInki Dae } 242f088d5a9SInki Dae 2431c248b7dSInki Dae int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data, 2441c248b7dSInki Dae struct drm_file *file_priv) 2451c248b7dSInki Dae { 2461c248b7dSInki Dae struct drm_exynos_gem_create *args = data; 247ee5e770eSJoonyoung Shim struct exynos_drm_gem_obj *exynos_gem_obj; 2482364839aSJoonyoung Shim int ret; 2491c248b7dSInki Dae 250f088d5a9SInki Dae DRM_DEBUG_KMS("%s\n", __FILE__); 2511c248b7dSInki Dae 2522b35892eSInki Dae exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size); 2531c248b7dSInki Dae if (IS_ERR(exynos_gem_obj)) 2541c248b7dSInki Dae return PTR_ERR(exynos_gem_obj); 2551c248b7dSInki Dae 2562364839aSJoonyoung Shim ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv, 2572364839aSJoonyoung Shim &args->handle); 2582364839aSJoonyoung Shim if (ret) { 2592364839aSJoonyoung Shim exynos_drm_gem_destroy(exynos_gem_obj); 2602364839aSJoonyoung Shim return ret; 2612364839aSJoonyoung Shim } 2622364839aSJoonyoung Shim 2631c248b7dSInki Dae return 0; 2641c248b7dSInki Dae } 2651c248b7dSInki Dae 266d87342c1SInki Dae dma_addr_t *exynos_drm_gem_get_dma_addr(struct drm_device *dev, 267f0b1bda7SInki Dae unsigned int gem_handle, 268d87342c1SInki Dae struct drm_file *filp) 269f0b1bda7SInki Dae { 270f0b1bda7SInki Dae struct exynos_drm_gem_obj *exynos_gem_obj; 271f0b1bda7SInki Dae struct drm_gem_object *obj; 272f0b1bda7SInki Dae 273d87342c1SInki Dae obj = drm_gem_object_lookup(dev, filp, gem_handle); 274f0b1bda7SInki Dae if (!obj) { 275f0b1bda7SInki Dae DRM_ERROR("failed to lookup gem object.\n"); 276f0b1bda7SInki Dae return ERR_PTR(-EINVAL); 277f0b1bda7SInki Dae } 278f0b1bda7SInki Dae 279f0b1bda7SInki Dae exynos_gem_obj = to_exynos_gem_obj(obj); 280f0b1bda7SInki Dae 281f0b1bda7SInki Dae return &exynos_gem_obj->buffer->dma_addr; 282f0b1bda7SInki Dae } 283f0b1bda7SInki Dae 284f0b1bda7SInki Dae void exynos_drm_gem_put_dma_addr(struct drm_device *dev, 285f0b1bda7SInki Dae unsigned int gem_handle, 286d87342c1SInki Dae struct drm_file *filp) 287f0b1bda7SInki Dae { 288f0b1bda7SInki Dae struct exynos_drm_gem_obj *exynos_gem_obj; 289f0b1bda7SInki Dae struct drm_gem_object *obj; 290f0b1bda7SInki Dae 291d87342c1SInki Dae obj = drm_gem_object_lookup(dev, filp, gem_handle); 292f0b1bda7SInki Dae if (!obj) { 293f0b1bda7SInki Dae DRM_ERROR("failed to lookup gem object.\n"); 294f0b1bda7SInki Dae return; 295f0b1bda7SInki Dae } 296f0b1bda7SInki Dae 297f0b1bda7SInki Dae exynos_gem_obj = to_exynos_gem_obj(obj); 298f0b1bda7SInki Dae 299f0b1bda7SInki Dae drm_gem_object_unreference_unlocked(obj); 300f0b1bda7SInki Dae 301f0b1bda7SInki Dae /* 302f0b1bda7SInki Dae * decrease obj->refcount one more time because we has already 303f0b1bda7SInki Dae * increased it at exynos_drm_gem_get_dma_addr(). 304f0b1bda7SInki Dae */ 305f0b1bda7SInki Dae drm_gem_object_unreference_unlocked(obj); 306f0b1bda7SInki Dae } 307f0b1bda7SInki Dae 3081c248b7dSInki Dae int exynos_drm_gem_map_offset_ioctl(struct drm_device *dev, void *data, 3091c248b7dSInki Dae struct drm_file *file_priv) 3101c248b7dSInki Dae { 3111c248b7dSInki Dae struct drm_exynos_gem_map_off *args = data; 3121c248b7dSInki Dae 3131c248b7dSInki Dae DRM_DEBUG_KMS("%s\n", __FILE__); 3141c248b7dSInki Dae 3151c248b7dSInki Dae DRM_DEBUG_KMS("handle = 0x%x, offset = 0x%lx\n", 3161c248b7dSInki Dae args->handle, (unsigned long)args->offset); 3171c248b7dSInki Dae 3181c248b7dSInki Dae if (!(dev->driver->driver_features & DRIVER_GEM)) { 3191c248b7dSInki Dae DRM_ERROR("does not support GEM.\n"); 3201c248b7dSInki Dae return -ENODEV; 3211c248b7dSInki Dae } 3221c248b7dSInki Dae 3231c248b7dSInki Dae return exynos_drm_gem_dumb_map_offset(file_priv, dev, args->handle, 3241c248b7dSInki Dae &args->offset); 3251c248b7dSInki Dae } 3261c248b7dSInki Dae 3275b07c660SInki Dae static struct drm_file *exynos_drm_find_drm_file(struct drm_device *drm_dev, 3285b07c660SInki Dae struct file *filp) 3295b07c660SInki Dae { 3305b07c660SInki Dae struct drm_file *file_priv; 3315b07c660SInki Dae 3325b07c660SInki Dae /* find current process's drm_file from filelist. */ 3335af9f116SYoungJun Cho list_for_each_entry(file_priv, &drm_dev->filelist, lhead) 3345af9f116SYoungJun Cho if (file_priv->filp == filp) 3355b07c660SInki Dae return file_priv; 3365b07c660SInki Dae 3375b07c660SInki Dae WARN_ON(1); 3385b07c660SInki Dae 3395b07c660SInki Dae return ERR_PTR(-EFAULT); 3405b07c660SInki Dae } 3415b07c660SInki Dae 3421c248b7dSInki Dae static int exynos_drm_gem_mmap_buffer(struct file *filp, 3431c248b7dSInki Dae struct vm_area_struct *vma) 3441c248b7dSInki Dae { 3451c248b7dSInki Dae struct drm_gem_object *obj = filp->private_data; 3461c248b7dSInki Dae struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj); 3475b07c660SInki Dae struct drm_device *drm_dev = obj->dev; 3482c871127SInki Dae struct exynos_drm_gem_buf *buffer; 3495b07c660SInki Dae struct drm_file *file_priv; 3500519f9a1SInki Dae unsigned long vm_size; 3515b07c660SInki Dae int ret; 3521c248b7dSInki Dae 3531c248b7dSInki Dae DRM_DEBUG_KMS("%s\n", __FILE__); 3541c248b7dSInki Dae 355314e51b9SKonstantin Khlebnikov vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP; 3565b07c660SInki Dae vma->vm_private_data = obj; 3575b07c660SInki Dae vma->vm_ops = drm_dev->driver->gem_vm_ops; 3585b07c660SInki Dae 3595b07c660SInki Dae /* restore it to driver's fops. */ 3605b07c660SInki Dae filp->f_op = fops_get(drm_dev->driver->fops); 3615b07c660SInki Dae 3625b07c660SInki Dae file_priv = exynos_drm_find_drm_file(drm_dev, filp); 3635b07c660SInki Dae if (IS_ERR(file_priv)) 3645b07c660SInki Dae return PTR_ERR(file_priv); 3655b07c660SInki Dae 3665b07c660SInki Dae /* restore it to drm_file. */ 3675b07c660SInki Dae filp->private_data = file_priv; 3681c248b7dSInki Dae 369c01d73faSInki Dae update_vm_cache_attr(exynos_gem_obj, vma); 3701c248b7dSInki Dae 3710519f9a1SInki Dae vm_size = vma->vm_end - vma->vm_start; 3722b35892eSInki Dae 3731c248b7dSInki Dae /* 3742c871127SInki Dae * a buffer contains information to physically continuous memory 3751c248b7dSInki Dae * allocated by user request or at framebuffer creation. 3761c248b7dSInki Dae */ 3772c871127SInki Dae buffer = exynos_gem_obj->buffer; 3781c248b7dSInki Dae 3791c248b7dSInki Dae /* check if user-requested size is valid. */ 3802c871127SInki Dae if (vm_size > buffer->size) 3811c248b7dSInki Dae return -EINVAL; 3821c248b7dSInki Dae 3834744ad24SInki Dae ret = dma_mmap_attrs(drm_dev->dev, vma, buffer->pages, 3840519f9a1SInki Dae buffer->dma_addr, buffer->size, 3850519f9a1SInki Dae &buffer->dma_attrs); 3865b07c660SInki Dae if (ret < 0) { 3875b07c660SInki Dae DRM_ERROR("failed to mmap.\n"); 3885b07c660SInki Dae return ret; 3895b07c660SInki Dae } 3905b07c660SInki Dae 3915b07c660SInki Dae /* 3925b07c660SInki Dae * take a reference to this mapping of the object. And this reference 3935b07c660SInki Dae * is unreferenced by the corresponding vm_close call. 3945b07c660SInki Dae */ 3955b07c660SInki Dae drm_gem_object_reference(obj); 3965b07c660SInki Dae 3975b07c660SInki Dae drm_vm_open_locked(drm_dev, vma); 3985b07c660SInki Dae 3995b07c660SInki Dae return 0; 4001c248b7dSInki Dae } 4011c248b7dSInki Dae 4021c248b7dSInki Dae static const struct file_operations exynos_drm_gem_fops = { 4031c248b7dSInki Dae .mmap = exynos_drm_gem_mmap_buffer, 4041c248b7dSInki Dae }; 4051c248b7dSInki Dae 4061c248b7dSInki Dae int exynos_drm_gem_mmap_ioctl(struct drm_device *dev, void *data, 4071c248b7dSInki Dae struct drm_file *file_priv) 4081c248b7dSInki Dae { 4091c248b7dSInki Dae struct drm_exynos_gem_mmap *args = data; 4101c248b7dSInki Dae struct drm_gem_object *obj; 4111c248b7dSInki Dae unsigned int addr; 4121c248b7dSInki Dae 4131c248b7dSInki Dae DRM_DEBUG_KMS("%s\n", __FILE__); 4141c248b7dSInki Dae 4151c248b7dSInki Dae if (!(dev->driver->driver_features & DRIVER_GEM)) { 4161c248b7dSInki Dae DRM_ERROR("does not support GEM.\n"); 4171c248b7dSInki Dae return -ENODEV; 4181c248b7dSInki Dae } 4191c248b7dSInki Dae 4201c248b7dSInki Dae obj = drm_gem_object_lookup(dev, file_priv, args->handle); 4211c248b7dSInki Dae if (!obj) { 4221c248b7dSInki Dae DRM_ERROR("failed to lookup gem object.\n"); 4231c248b7dSInki Dae return -EINVAL; 4241c248b7dSInki Dae } 4251c248b7dSInki Dae 4265b07c660SInki Dae /* 4275af9f116SYoungJun Cho * We have to use gem object and its fops for specific mmaper, 4285af9f116SYoungJun Cho * but vm_mmap() can deliver only filp. So we have to change 4295af9f116SYoungJun Cho * filp->f_op and filp->private_data temporarily, then restore 4305af9f116SYoungJun Cho * again. So it is important to keep lock until restoration the 4315af9f116SYoungJun Cho * settings to prevent others from misuse of filp->f_op or 4325af9f116SYoungJun Cho * filp->private_data. 4335af9f116SYoungJun Cho */ 4345af9f116SYoungJun Cho mutex_lock(&dev->struct_mutex); 4355af9f116SYoungJun Cho 4365af9f116SYoungJun Cho /* 4375b07c660SInki Dae * Set specific mmper's fops. And it will be restored by 4385b07c660SInki Dae * exynos_drm_gem_mmap_buffer to dev->driver->fops. 4395b07c660SInki Dae * This is used to call specific mapper temporarily. 4405b07c660SInki Dae */ 4415b07c660SInki Dae file_priv->filp->f_op = &exynos_drm_gem_fops; 4421c248b7dSInki Dae 4435b07c660SInki Dae /* 4445b07c660SInki Dae * Set gem object to private_data so that specific mmaper 4455b07c660SInki Dae * can get the gem object. And it will be restored by 4465b07c660SInki Dae * exynos_drm_gem_mmap_buffer to drm_file. 4475b07c660SInki Dae */ 4485b07c660SInki Dae file_priv->filp->private_data = obj; 4495b07c660SInki Dae 4505b07c660SInki Dae addr = vm_mmap(file_priv->filp, 0, args->size, 4511c248b7dSInki Dae PROT_READ | PROT_WRITE, MAP_SHARED, 0); 4521c248b7dSInki Dae 4535af9f116SYoungJun Cho drm_gem_object_unreference(obj); 4541c248b7dSInki Dae 4555b07c660SInki Dae if (IS_ERR((void *)addr)) { 4565af9f116SYoungJun Cho /* check filp->f_op, filp->private_data are restored */ 4575af9f116SYoungJun Cho if (file_priv->filp->f_op == &exynos_drm_gem_fops) { 4585af9f116SYoungJun Cho file_priv->filp->f_op = fops_get(dev->driver->fops); 4595b07c660SInki Dae file_priv->filp->private_data = file_priv; 4605af9f116SYoungJun Cho } 4615af9f116SYoungJun Cho mutex_unlock(&dev->struct_mutex); 4621c248b7dSInki Dae return PTR_ERR((void *)addr); 4635b07c660SInki Dae } 4641c248b7dSInki Dae 4655af9f116SYoungJun Cho mutex_unlock(&dev->struct_mutex); 4665af9f116SYoungJun Cho 4671c248b7dSInki Dae args->mapped = addr; 4681c248b7dSInki Dae 4691c248b7dSInki Dae DRM_DEBUG_KMS("mapped = 0x%lx\n", (unsigned long)args->mapped); 4701c248b7dSInki Dae 4711c248b7dSInki Dae return 0; 4721c248b7dSInki Dae } 4731c248b7dSInki Dae 47440cd7e0cSInki Dae int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data, 47540cd7e0cSInki Dae struct drm_file *file_priv) 47640cd7e0cSInki Dae { struct exynos_drm_gem_obj *exynos_gem_obj; 47740cd7e0cSInki Dae struct drm_exynos_gem_info *args = data; 47840cd7e0cSInki Dae struct drm_gem_object *obj; 47940cd7e0cSInki Dae 48040cd7e0cSInki Dae mutex_lock(&dev->struct_mutex); 48140cd7e0cSInki Dae 48240cd7e0cSInki Dae obj = drm_gem_object_lookup(dev, file_priv, args->handle); 48340cd7e0cSInki Dae if (!obj) { 48440cd7e0cSInki Dae DRM_ERROR("failed to lookup gem object.\n"); 48540cd7e0cSInki Dae mutex_unlock(&dev->struct_mutex); 48640cd7e0cSInki Dae return -EINVAL; 48740cd7e0cSInki Dae } 48840cd7e0cSInki Dae 48940cd7e0cSInki Dae exynos_gem_obj = to_exynos_gem_obj(obj); 49040cd7e0cSInki Dae 49140cd7e0cSInki Dae args->flags = exynos_gem_obj->flags; 49240cd7e0cSInki Dae args->size = exynos_gem_obj->size; 49340cd7e0cSInki Dae 49440cd7e0cSInki Dae drm_gem_object_unreference(obj); 49540cd7e0cSInki Dae mutex_unlock(&dev->struct_mutex); 49640cd7e0cSInki Dae 49740cd7e0cSInki Dae return 0; 49840cd7e0cSInki Dae } 49940cd7e0cSInki Dae 5002a3098ffSInki Dae struct vm_area_struct *exynos_gem_get_vma(struct vm_area_struct *vma) 5012a3098ffSInki Dae { 5022a3098ffSInki Dae struct vm_area_struct *vma_copy; 5032a3098ffSInki Dae 5042a3098ffSInki Dae vma_copy = kmalloc(sizeof(*vma_copy), GFP_KERNEL); 5052a3098ffSInki Dae if (!vma_copy) 5062a3098ffSInki Dae return NULL; 5072a3098ffSInki Dae 5082a3098ffSInki Dae if (vma->vm_ops && vma->vm_ops->open) 5092a3098ffSInki Dae vma->vm_ops->open(vma); 5102a3098ffSInki Dae 5112a3098ffSInki Dae if (vma->vm_file) 5122a3098ffSInki Dae get_file(vma->vm_file); 5132a3098ffSInki Dae 5142a3098ffSInki Dae memcpy(vma_copy, vma, sizeof(*vma)); 5152a3098ffSInki Dae 5162a3098ffSInki Dae vma_copy->vm_mm = NULL; 5172a3098ffSInki Dae vma_copy->vm_next = NULL; 5182a3098ffSInki Dae vma_copy->vm_prev = NULL; 5192a3098ffSInki Dae 5202a3098ffSInki Dae return vma_copy; 5212a3098ffSInki Dae } 5222a3098ffSInki Dae 5232a3098ffSInki Dae void exynos_gem_put_vma(struct vm_area_struct *vma) 5242a3098ffSInki Dae { 5252a3098ffSInki Dae if (!vma) 5262a3098ffSInki Dae return; 5272a3098ffSInki Dae 5282a3098ffSInki Dae if (vma->vm_ops && vma->vm_ops->close) 5292a3098ffSInki Dae vma->vm_ops->close(vma); 5302a3098ffSInki Dae 5312a3098ffSInki Dae if (vma->vm_file) 5322a3098ffSInki Dae fput(vma->vm_file); 5332a3098ffSInki Dae 5342a3098ffSInki Dae kfree(vma); 5352a3098ffSInki Dae } 5362a3098ffSInki Dae 5372a3098ffSInki Dae int exynos_gem_get_pages_from_userptr(unsigned long start, 5382a3098ffSInki Dae unsigned int npages, 5392a3098ffSInki Dae struct page **pages, 5402a3098ffSInki Dae struct vm_area_struct *vma) 5412a3098ffSInki Dae { 5422a3098ffSInki Dae int get_npages; 5432a3098ffSInki Dae 5442a3098ffSInki Dae /* the memory region mmaped with VM_PFNMAP. */ 5452a3098ffSInki Dae if (vma_is_io(vma)) { 5462a3098ffSInki Dae unsigned int i; 5472a3098ffSInki Dae 5482a3098ffSInki Dae for (i = 0; i < npages; ++i, start += PAGE_SIZE) { 5492a3098ffSInki Dae unsigned long pfn; 5502a3098ffSInki Dae int ret = follow_pfn(vma, start, &pfn); 5512a3098ffSInki Dae if (ret) 5522a3098ffSInki Dae return ret; 5532a3098ffSInki Dae 5542a3098ffSInki Dae pages[i] = pfn_to_page(pfn); 5552a3098ffSInki Dae } 5562a3098ffSInki Dae 5572a3098ffSInki Dae if (i != npages) { 5582a3098ffSInki Dae DRM_ERROR("failed to get user_pages.\n"); 5592a3098ffSInki Dae return -EINVAL; 5602a3098ffSInki Dae } 5612a3098ffSInki Dae 5622a3098ffSInki Dae return 0; 5632a3098ffSInki Dae } 5642a3098ffSInki Dae 5652a3098ffSInki Dae get_npages = get_user_pages(current, current->mm, start, 5662a3098ffSInki Dae npages, 1, 1, pages, NULL); 5672a3098ffSInki Dae get_npages = max(get_npages, 0); 5682a3098ffSInki Dae if (get_npages != npages) { 5692a3098ffSInki Dae DRM_ERROR("failed to get user_pages.\n"); 5702a3098ffSInki Dae while (get_npages) 5712a3098ffSInki Dae put_page(pages[--get_npages]); 5722a3098ffSInki Dae return -EFAULT; 5732a3098ffSInki Dae } 5742a3098ffSInki Dae 5752a3098ffSInki Dae return 0; 5762a3098ffSInki Dae } 5772a3098ffSInki Dae 5782a3098ffSInki Dae void exynos_gem_put_pages_to_userptr(struct page **pages, 5792a3098ffSInki Dae unsigned int npages, 5802a3098ffSInki Dae struct vm_area_struct *vma) 5812a3098ffSInki Dae { 5822a3098ffSInki Dae if (!vma_is_io(vma)) { 5832a3098ffSInki Dae unsigned int i; 5842a3098ffSInki Dae 5852a3098ffSInki Dae for (i = 0; i < npages; i++) { 5862a3098ffSInki Dae set_page_dirty_lock(pages[i]); 5872a3098ffSInki Dae 5882a3098ffSInki Dae /* 5892a3098ffSInki Dae * undo the reference we took when populating 5902a3098ffSInki Dae * the table. 5912a3098ffSInki Dae */ 5922a3098ffSInki Dae put_page(pages[i]); 5932a3098ffSInki Dae } 5942a3098ffSInki Dae } 5952a3098ffSInki Dae } 5962a3098ffSInki Dae 5972a3098ffSInki Dae int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev, 5982a3098ffSInki Dae struct sg_table *sgt, 5992a3098ffSInki Dae enum dma_data_direction dir) 6002a3098ffSInki Dae { 6012a3098ffSInki Dae int nents; 6022a3098ffSInki Dae 6032a3098ffSInki Dae mutex_lock(&drm_dev->struct_mutex); 6042a3098ffSInki Dae 6052a3098ffSInki Dae nents = dma_map_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir); 6062a3098ffSInki Dae if (!nents) { 6072a3098ffSInki Dae DRM_ERROR("failed to map sgl with dma.\n"); 6082a3098ffSInki Dae mutex_unlock(&drm_dev->struct_mutex); 6092a3098ffSInki Dae return nents; 6102a3098ffSInki Dae } 6112a3098ffSInki Dae 6122a3098ffSInki Dae mutex_unlock(&drm_dev->struct_mutex); 6132a3098ffSInki Dae return 0; 6142a3098ffSInki Dae } 6152a3098ffSInki Dae 6162a3098ffSInki Dae void exynos_gem_unmap_sgt_from_dma(struct drm_device *drm_dev, 6172a3098ffSInki Dae struct sg_table *sgt, 6182a3098ffSInki Dae enum dma_data_direction dir) 6192a3098ffSInki Dae { 6202a3098ffSInki Dae dma_unmap_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir); 6212a3098ffSInki Dae } 6222a3098ffSInki Dae 6231c248b7dSInki Dae int exynos_drm_gem_init_object(struct drm_gem_object *obj) 6241c248b7dSInki Dae { 6251c248b7dSInki Dae DRM_DEBUG_KMS("%s\n", __FILE__); 6261c248b7dSInki Dae 6271c248b7dSInki Dae return 0; 6281c248b7dSInki Dae } 6291c248b7dSInki Dae 630ee5e770eSJoonyoung Shim void exynos_drm_gem_free_object(struct drm_gem_object *obj) 6311c248b7dSInki Dae { 632b2df26c1SInki Dae struct exynos_drm_gem_obj *exynos_gem_obj; 633b2df26c1SInki Dae struct exynos_drm_gem_buf *buf; 634b2df26c1SInki Dae 6351c248b7dSInki Dae DRM_DEBUG_KMS("%s\n", __FILE__); 6361c248b7dSInki Dae 637b2df26c1SInki Dae exynos_gem_obj = to_exynos_gem_obj(obj); 638b2df26c1SInki Dae buf = exynos_gem_obj->buffer; 639b2df26c1SInki Dae 640b2df26c1SInki Dae if (obj->import_attach) 641b2df26c1SInki Dae drm_prime_gem_destroy(obj, buf->sgt); 642b2df26c1SInki Dae 6432364839aSJoonyoung Shim exynos_drm_gem_destroy(to_exynos_gem_obj(obj)); 6441c248b7dSInki Dae } 6451c248b7dSInki Dae 6461c248b7dSInki Dae int exynos_drm_gem_dumb_create(struct drm_file *file_priv, 647ee5e770eSJoonyoung Shim struct drm_device *dev, 648ee5e770eSJoonyoung Shim struct drm_mode_create_dumb *args) 6491c248b7dSInki Dae { 6501c248b7dSInki Dae struct exynos_drm_gem_obj *exynos_gem_obj; 6512364839aSJoonyoung Shim int ret; 6521c248b7dSInki Dae 6531c248b7dSInki Dae DRM_DEBUG_KMS("%s\n", __FILE__); 6541c248b7dSInki Dae 6551c248b7dSInki Dae /* 6561c248b7dSInki Dae * alocate memory to be used for framebuffer. 6571c248b7dSInki Dae * - this callback would be called by user application 6581c248b7dSInki Dae * with DRM_IOCTL_MODE_CREATE_DUMB command. 6591c248b7dSInki Dae */ 6601c248b7dSInki Dae 6613fd6b694SCooper Yuan args->pitch = args->width * ((args->bpp + 7) / 8); 6627da5907cSInki Dae args->size = args->pitch * args->height; 6631c248b7dSInki Dae 6642b35892eSInki Dae exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size); 6651c248b7dSInki Dae if (IS_ERR(exynos_gem_obj)) 6661c248b7dSInki Dae return PTR_ERR(exynos_gem_obj); 6671c248b7dSInki Dae 6682364839aSJoonyoung Shim ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv, 6692364839aSJoonyoung Shim &args->handle); 6702364839aSJoonyoung Shim if (ret) { 6712364839aSJoonyoung Shim exynos_drm_gem_destroy(exynos_gem_obj); 6722364839aSJoonyoung Shim return ret; 6732364839aSJoonyoung Shim } 6742364839aSJoonyoung Shim 6751c248b7dSInki Dae return 0; 6761c248b7dSInki Dae } 6771c248b7dSInki Dae 6781c248b7dSInki Dae int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv, 679ee5e770eSJoonyoung Shim struct drm_device *dev, uint32_t handle, 680ee5e770eSJoonyoung Shim uint64_t *offset) 6811c248b7dSInki Dae { 6821c248b7dSInki Dae struct drm_gem_object *obj; 6832d91cf17SJoonyoung Shim int ret = 0; 6841c248b7dSInki Dae 6851c248b7dSInki Dae DRM_DEBUG_KMS("%s\n", __FILE__); 6861c248b7dSInki Dae 6871c248b7dSInki Dae mutex_lock(&dev->struct_mutex); 6881c248b7dSInki Dae 6891c248b7dSInki Dae /* 6901c248b7dSInki Dae * get offset of memory allocated for drm framebuffer. 6911c248b7dSInki Dae * - this callback would be called by user application 6921c248b7dSInki Dae * with DRM_IOCTL_MODE_MAP_DUMB command. 6931c248b7dSInki Dae */ 6941c248b7dSInki Dae 6951c248b7dSInki Dae obj = drm_gem_object_lookup(dev, file_priv, handle); 6961c248b7dSInki Dae if (!obj) { 6971c248b7dSInki Dae DRM_ERROR("failed to lookup gem object.\n"); 6982d91cf17SJoonyoung Shim ret = -EINVAL; 6992d91cf17SJoonyoung Shim goto unlock; 7001c248b7dSInki Dae } 7011c248b7dSInki Dae 7026037bafaSLaurent Pinchart if (!obj->map_list.map) { 7036037bafaSLaurent Pinchart ret = drm_gem_create_mmap_offset(obj); 7042d91cf17SJoonyoung Shim if (ret) 7052d91cf17SJoonyoung Shim goto out; 7062d91cf17SJoonyoung Shim } 7071c248b7dSInki Dae 7086037bafaSLaurent Pinchart *offset = (u64)obj->map_list.hash.key << PAGE_SHIFT; 7091c248b7dSInki Dae DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset); 7101c248b7dSInki Dae 7112d91cf17SJoonyoung Shim out: 7122d91cf17SJoonyoung Shim drm_gem_object_unreference(obj); 7132d91cf17SJoonyoung Shim unlock: 7141c248b7dSInki Dae mutex_unlock(&dev->struct_mutex); 7152d91cf17SJoonyoung Shim return ret; 7161c248b7dSInki Dae } 7171c248b7dSInki Dae 718ee5e770eSJoonyoung Shim int exynos_drm_gem_dumb_destroy(struct drm_file *file_priv, 719ee5e770eSJoonyoung Shim struct drm_device *dev, 720ee5e770eSJoonyoung Shim unsigned int handle) 721ee5e770eSJoonyoung Shim { 722ee5e770eSJoonyoung Shim int ret; 723ee5e770eSJoonyoung Shim 724ee5e770eSJoonyoung Shim DRM_DEBUG_KMS("%s\n", __FILE__); 725ee5e770eSJoonyoung Shim 726ee5e770eSJoonyoung Shim /* 727ee5e770eSJoonyoung Shim * obj->refcount and obj->handle_count are decreased and 728ee5e770eSJoonyoung Shim * if both them are 0 then exynos_drm_gem_free_object() 729ee5e770eSJoonyoung Shim * would be called by callback to release resources. 730ee5e770eSJoonyoung Shim */ 731ee5e770eSJoonyoung Shim ret = drm_gem_handle_delete(file_priv, handle); 732ee5e770eSJoonyoung Shim if (ret < 0) { 733ee5e770eSJoonyoung Shim DRM_ERROR("failed to delete drm_gem_handle.\n"); 734ee5e770eSJoonyoung Shim return ret; 735ee5e770eSJoonyoung Shim } 736ee5e770eSJoonyoung Shim 737ee5e770eSJoonyoung Shim return 0; 738ee5e770eSJoonyoung Shim } 739ee5e770eSJoonyoung Shim 7401c248b7dSInki Dae int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 7411c248b7dSInki Dae { 7421c248b7dSInki Dae struct drm_gem_object *obj = vma->vm_private_data; 7431c248b7dSInki Dae struct drm_device *dev = obj->dev; 7442b35892eSInki Dae unsigned long f_vaddr; 7451c248b7dSInki Dae pgoff_t page_offset; 7461c248b7dSInki Dae int ret; 7471c248b7dSInki Dae 7481c248b7dSInki Dae page_offset = ((unsigned long)vmf->virtual_address - 7491c248b7dSInki Dae vma->vm_start) >> PAGE_SHIFT; 7502b35892eSInki Dae f_vaddr = (unsigned long)vmf->virtual_address; 7511c248b7dSInki Dae 7521c248b7dSInki Dae mutex_lock(&dev->struct_mutex); 7531c248b7dSInki Dae 7540519f9a1SInki Dae ret = exynos_drm_gem_map_buf(obj, vma, f_vaddr, page_offset); 7552b35892eSInki Dae if (ret < 0) 7560519f9a1SInki Dae DRM_ERROR("failed to map a buffer with user.\n"); 7571c248b7dSInki Dae 7581c248b7dSInki Dae mutex_unlock(&dev->struct_mutex); 7591c248b7dSInki Dae 7601c248b7dSInki Dae return convert_to_vm_err_msg(ret); 7611c248b7dSInki Dae } 7621c248b7dSInki Dae 7631c248b7dSInki Dae int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma) 7641c248b7dSInki Dae { 765c01d73faSInki Dae struct exynos_drm_gem_obj *exynos_gem_obj; 766c01d73faSInki Dae struct drm_gem_object *obj; 7671c248b7dSInki Dae int ret; 7681c248b7dSInki Dae 7691c248b7dSInki Dae DRM_DEBUG_KMS("%s\n", __FILE__); 7701c248b7dSInki Dae 7711c248b7dSInki Dae /* set vm_area_struct. */ 7721c248b7dSInki Dae ret = drm_gem_mmap(filp, vma); 7731c248b7dSInki Dae if (ret < 0) { 7741c248b7dSInki Dae DRM_ERROR("failed to mmap.\n"); 7751c248b7dSInki Dae return ret; 7761c248b7dSInki Dae } 7771c248b7dSInki Dae 778c01d73faSInki Dae obj = vma->vm_private_data; 779c01d73faSInki Dae exynos_gem_obj = to_exynos_gem_obj(obj); 780c01d73faSInki Dae 781c01d73faSInki Dae ret = check_gem_flags(exynos_gem_obj->flags); 782c01d73faSInki Dae if (ret) { 783c01d73faSInki Dae drm_gem_vm_close(vma); 784c01d73faSInki Dae drm_gem_free_mmap_offset(obj); 785c01d73faSInki Dae return ret; 786c01d73faSInki Dae } 787c01d73faSInki Dae 7881c248b7dSInki Dae vma->vm_flags &= ~VM_PFNMAP; 7891c248b7dSInki Dae vma->vm_flags |= VM_MIXEDMAP; 7901c248b7dSInki Dae 791c01d73faSInki Dae update_vm_cache_attr(exynos_gem_obj, vma); 792c01d73faSInki Dae 7931c248b7dSInki Dae return ret; 7941c248b7dSInki Dae } 795